Direct current power supply



FIG. 1 is a perspective view of the direct current power supply;

FIG. 2 is a front view of the direct current power supply, the back viewbeing a mirror image the front view;

FIG. 3 is a bottom view of the direct current power supply;

FIG. 4 is a top view of the direct current power supply; and,

FIG. 5 is a right side view of the direct current power supply, the leftside view being a mirror image the right side view.

The ornamental design for a direct current power supply, as shown anddescribed.